001 // Copyright 2008, 2011 The Apache Software Foundation002 //003 // Licensed under the Apache License, Version 2.0 (the "License");004 // you may not use this file except in compliance with the License.005 // You may obtain a copy of the License at006 //007 // http://www.apache.org/licenses/LICENSE-2.0008 //009 // Unless required by applicable law or agreed to in writing, software010 // distributed under the License is distributed on an "AS IS" BASIS,011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.012 // See the License for the specific language governing permissions and013 // limitations under the License.014015 package org.apache.tapestry5.corelib.components;016017 import org.apache.tapestry5.annotations.Parameter;018 import org.apache.tapestry5.corelib.base.AbstractConditional;019020 /**021 * A close relative of the {@link org.apache.tapestry5.corelib.components.If} component that inverts the meaning of its022 * test. This is easier than an {@link org.apache.tapestry5.corelib.components.If} component with the negate parameter set to {@code true}.023 * 024 * @tapestrydoc025 */026 public class Unless extends AbstractConditional027 {028 /**029 * If true, then the body of the component is omitted. If false, the body is rendered.030 */031 @Parameter(required = true)032 private boolean test;033034 /**035 * @return test parameter inverted036 */037 protected boolean test()038 {039 return !test;040 }041 }